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Polarized nonsensitive efficient superconducting nanowire single photon detector

A single-photon detector and superconducting nanowire technology, applied in the field of light detection, can solve the problem of light polarization direction sensitivity, and achieve the effects of polarization insensitivity, high industrial utilization value, and high absorption efficiency.

Inactive Publication Date: 2015-08-12
NANJING UNIV
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Problems solved by technology

[0007] In view of the shortcomings of the prior art described above, the object of the present invention is to provide a polarization-insensitive and high-efficiency superconducting nanowire single photon detector, which is used to solve the problem of the superconducting nanowire single photon detector in the prior art. The problem of light polarization direction sensitivity

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Embodiment

[0029] Such as figure 1 and figure 2 As shown, the present embodiment provides a polarization-insensitive and high-efficiency superconducting nanowire single-photon detector, including:

[0030] substrate1;

[0031] a dielectric half mirror 2, combined on the surface of the substrate 1;

[0032] The lower optical cavity 3 is combined with the surface of the dielectric half mirror 2;

[0033] The dielectric wrapping layer 4 is combined with the surface of the lower optical cavity 3;

[0034] NbN nanowires 5, combined inside the dielectric wrapping layer 4;

[0035] The upper optical cavity 7 is combined with the surface of the dielectric cladding layer 4;

[0036] Dielectric nanowires 6, combined between the dielectric cladding layer 4 and the upper optical cavity 7;

[0037] The total reflection mirror 8 is combined with the surface of the upper optical cavity 7 .

[0038] As an example, the polarization-insensitive and high-absorptivity superconducting nanowire single...

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Abstract

The invention discloses a polarized nonsensitive efficient superconducting nanowire single photon detector. The detector comprises a substrate, a medium semi-reflective mirror combined on the surface of the substrate, a lower optical cavity combined on the surface of the medium semi-reflective mirror, a medium wrapping layer combined on the surface of the lower optical cavity, NbN nanowires combined inside the medium wrapping layer, an upper optical cavity combined on the surface of the medium wrapping layer, medium nanowires combined between the medium wrapping layer and the upper optical cavity, and an all-reflective mirror combined on the surface of the upper optical cavity. Through adoption of the polarized nonsensitive efficient superconducting nanowire single photon detector, the problem in the prior art that the superconducting nanowire single photon detector is sensitive to optical polarization direction is solved.

Description

technical field [0001] The invention belongs to the technical field of light detection, and relates to a superconducting nanowire single-photon detector, in particular to a polarization-insensitive and high-efficiency superconducting nanowire single-photon detector. Background technique [0002] Superconducting Nanowire Single Photon Detector (SNSPD) is a new type of single photon detector, which can realize single photon detection from visible light band to infrared band. [0003] SNSPD generally works in a low temperature environment lower than 4K, and adds a bias current slightly smaller than the critical current. When a single photon is absorbed by a superconducting nanowire, the Cooper electron pairs are destroyed to generate a large number of hot electrons, which form a hot spot locally; region, the nanowires are quenched. After a relaxation time, the thermal electrons interact with the acoustic electrons to re-form Cooper electron pairs, and the nanowires regain the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L39/00H01L39/02H10N60/00H10N60/80
Inventor 朱广浩秦得凤金彪兵郑帆康琳张蜡宝贾小氢吴培亨
Owner NANJING UNIV
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